Active filtration device and active circulation type water tank equipped with this

摘要

PROBLEM TO BE SOLVED: To provide both an active filter capable of feeding a moderate amount of oxygen without using an air pump, etc., and an active circulating type water tank equipped with the active filter. SOLUTION: This active filter 1 is obtained by connectedly installing the first filtration chamber 8, equipped with a water inflow port 14 from a water tank and filled with a coarse filter medium 15, the second filtration chamber 9, provided with an overflow plate 18 having a triangular weir on the side of the first filtration chamber 8 and filled with a fine filter medium 21, further the third filtration chamber 10, equipped with an overflow plate 23 having a triangular weir on the side of the second filtration chamber 9 and filled with a microfine filter medium 26 and a storage pump chamber 11 equipped with an overflow plate 28 having a triangular weir on the side of the third filtration chamber 10 to produce bubbles on the water surface by falling water from the respective triangular weirs. The active circulating type water tank is obtained by integrally installing the active filter 1 with the water tank.